Adiantum diaphanum Blume

Species

Pteridophytes > Polypodiales > Pteridaceae > Vittarioideae > Adiantum

Characteristics

Plants epilithic, 15-30 cm tall. Rhizomes erect, short, scales dark brown, lanceolate, margins denticulate. Fronds clustered; stipe castaneous, glossy, 4-20 cm, slender, adaxially grooved, base sparsely covered with same scales as rhizome, distally glabrous; lamina 1-pinnate or 2-pinnate with a few lateral pinnae nearly as large as terminal pinna, deltoid-lanceolate in outline, 6-11 × 2-3 cm; rachis, costae, and stalks castaneous, glabrous; pinnules 8-16 pairs per pinna, alternate, obliquely spreading or lower ones subhorizontally spreading; stalk less than 2 mm; blade uniform in size, dimidiate, rhombic or quadrangular, 1-1.8 × 0.5-0.9 cm, membranous, abaxially slightly glaucous and with lax, appressed, brown, unicellular needlelike setae, adaxially glossy, dark brown or deep olive-green, base asymmetrical, broadly cuneate, margin with rounded sinuses, outer margin obtuse or truncate, upper margin truncate or rounded, distal pinnules similar but slightly smaller; terminal pinnules rhombic, slightly larger; veins flabellately forked, reaching margins, visible on both surfaces. Sori 2-10 per pinnule, inserted in sinuses between lobes except those attached along veinlet but also on mesophyll between veinlets; false indusia dark brown, orbicular, leathery, upper margins deeply sinuate and with unicellular, brown, needlelike setae, persistent. Perispore indistinctly granular. 2n = 116, 232.
More
Rhizome erect, c. 2 mm diam.; scales concolorous, golden brown, with entire margins and prominent apical seta. Roots with ovoid proliferous tubers to c. 1.5 mm long. Fronds tufted, to 36 cm long. Stipe to 18 cm long, smooth adaxially, scabrous abaxially. Lamina 1-pinnate, or 2 (3)-pinnate at the base and 1-pinnate above, subpedate, hastate or triangular, 5–17 cm long, 2–13 cm wide, membranous; rachis flexuose, glossy, glabrous. Basal pinnae, when present, 1 or 2 (rarely more), narrowly triangular, 1-or 2-pinnate. Pinnules dimidiate, rectangular to subtrapeziform, becoming cuneate-flabellate in apical segments, sparsely to very sparsely setose; distal margins shallowly lobed, denticulate when sterile; veins dark brown near stalk, otherwise pale. Sori 1–10 along distal margins, usually 1 per lobe; soral flaps round to subreniform, setose (rarely glabrous), deeply immersed in the lobe. Spores ?64 per sporangium, yellow; perine scabrous; largest diam. (25.6–) 33.9 (–51.9) µm. See also Green (1994: 563).
Rhizome short, ascending, clad in dark brown linear-subulate attenuate paleae, c. 3-4 mm. long, us. with small tuber-like expansions; stipites tufted to clustered. Stipes slender to filiform, very dark brown, glab. except at paleate base. Rhachis filiform, glab., ± flexuous, bearing simple pinnae or 1-4 secondary pinnae in lower portion. Lamina rather dark green, delicate, flaccid. bearing sparse minute stiff hairs, to glab., narrow-to ovate-oblong. Lateral pinnae (1-4, if present) 4-15 × 1-2 cm., stalked, narrow-oblong. Terminal or sole pinna up to 13 × 2.5 cm., oblong to ovate-oblong. Pinnules dimidiate-oblong, stalked, sparingly setulose, up to 15 × 8 mm.; lower margin entire, straight or slightly curved; upper with numerous lobes or teeth. Sporangia in sinuses of lobes, protected by reflexed pale to dark brown, lunulate margin; 4-8 groups per pinnule.
Rhizomes short, erect, scaly; rootlets bearing small tubers. Stipes and rachises glabrous except at very base. Laminae either 1-pinnate with 5-16 undivided pinnae on each side of rachis, or 2-pinnate with 1-(2) pairs of primary pinnae bearing secondary pinnae and a terminal portion with 12-25 undivided primary pinnae on each side; 1-pinnate fronds 5-10 × 1.5-3 cm, narrowly triangular; 2-pinnate fronds 8-20 × 4-18 cm, 3-fid. Ultimate pinnules ± oblong or parallelogrammoid, tending to curve basiscopically, 5-20 × 4-10 mm; stalk attached at proximal corner; upper and outer margins regularly lobed, inner and lower margins entire; upper surface glabrous, lower hairy or glabrous, both dark green. Indusia ± reniform with prominent sinuses, hairy or glabrous, up to 8 per pinnule on upper and outer margins.
Life form perennial
Growth form
Growth support free-standing
Foliage retention deciduous
Sexuality -
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.15 - 0.3
Root system rhizome
Rooting depth (meter) -
Root diameter (meter) -
Flower color -
Blooming months -
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

Terrestrial or lithophytic beside streams, often in spray zone from waterfalls, in rainforest. On Norfolk Island common on earthy banks in forest, as, for example, in the National Park (Green 1994: 563).
Light -
Soil humidity 5-7
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 9-11

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Adiantum diaphanum unspecified picture

Distribution

Adiantum diaphanum world distribution map, present in Australia, China, Indonesia, Japan, Lao People's Democratic Republic, New Zealand, Philippines, Papua New Guinea, Solomon Islands, Tonga, Taiwan, Province of China, Viet Nam, and Samoa

Identifiers

LSID urn:lsid:ipni.org:names:325036-2
WFO ID wfo-0001116575
COL ID 64RFR
BDTFX ID -
INPN ID 670879
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Adiantum heteromorphum Adiantum muelleri Adiantum tuberosum Adiantum diaphanum Adiantum filicaule Adiantum erectum Adiantum setulosum Adiantum diaphanum var. affine Adiantum hispidulum var. fitzalanii Adiantum tenue var. commutatum